Influence of current collecting and functional layer thickness on the performance stability of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ -Ce 0.8 Sm 0.2 O 1.9 composite cathode

S. A. Muhammed Ali, Mustafa Anwar, Lily Siong Mahmud, Noor Shieela Kalib, Andanastuti Muchtar, Mahendra Rao Somalu

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Abstract

The effect of current collecting layer (CCL) and cathode functional layer (CFL) thicknesses on the catalytic activity of the La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ -Ce 0.8 Sm 0.2 O 1.9 (LSCF-SDC) composite cathode was investigated by electrochemical impedance spectroscopy at 600 °C for 100 h. Results revealed that the charge transfer process associated with the incorporation of O 2− ions and the surface oxygen reduction reaction rate are dependent on CFL and CCL thicknesses, respectively. Area-specific resistance is dependent on CCL thickness in high-frequency arcs and on CFL thickness in low-frequency arcs. No significant change was observed in area-specific resistance value as the thickness of LSCF CCL decreased (25–5 μm) while the LSCF-SDC CFL thickness (5-25 μm) was gradually increased. However, the LSCF-SDC composite cathode (without CCL) showed poor catalytic activity toward the oxygen reduction reaction and had a high area-specific resistance value (3.31 Ω cm 2 ). When LSCF CCL (5 μm) was used, the area-specific resistance value decreased by 16 times relative to the ASR of a sample without CCL. The field emission scanning electron microscopy results indicated that these cathodes exhibited a clear change in microstructure on the surface of the LSCF CCL after 100 h of thermal treatment in oxygen. The particle agglomeration and Sr surface segregation affected the surface catalytic activity toward oxygen reduction reaction at the LSCF CCL. As a result, the ASR value increased gradually in 100 h thermal treatment. [Figure not available: see fulltext.]

Original languageEnglish
JournalJournal of Solid State Electrochemistry
DOIs
Publication statusPublished - 1 Jan 2019

Fingerprint

Cathodes
cathodes
composite materials
Composite materials
Oxygen
Catalyst activity
Heat treatment
catalytic activity
Surface segregation
oxygen
Electrochemical impedance spectroscopy
Field emission
Reaction rates
Charge transfer
arcs
Agglomeration
Ions
Microstructure
Scanning electron microscopy
agglomeration

Keywords

  • Composite cathode
  • Current collector
  • Solid oxide fuel cell
  • Stability
  • Thickness

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry
  • Electrical and Electronic Engineering

Cite this

@article{23415f16190e4c31ac81cf6c9fe4b246,
title = "Influence of current collecting and functional layer thickness on the performance stability of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ -Ce 0.8 Sm 0.2 O 1.9 composite cathode",
abstract = "The effect of current collecting layer (CCL) and cathode functional layer (CFL) thicknesses on the catalytic activity of the La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ -Ce 0.8 Sm 0.2 O 1.9 (LSCF-SDC) composite cathode was investigated by electrochemical impedance spectroscopy at 600 °C for 100 h. Results revealed that the charge transfer process associated with the incorporation of O 2− ions and the surface oxygen reduction reaction rate are dependent on CFL and CCL thicknesses, respectively. Area-specific resistance is dependent on CCL thickness in high-frequency arcs and on CFL thickness in low-frequency arcs. No significant change was observed in area-specific resistance value as the thickness of LSCF CCL decreased (25–5 μm) while the LSCF-SDC CFL thickness (5-25 μm) was gradually increased. However, the LSCF-SDC composite cathode (without CCL) showed poor catalytic activity toward the oxygen reduction reaction and had a high area-specific resistance value (3.31 Ω cm 2 ). When LSCF CCL (5 μm) was used, the area-specific resistance value decreased by 16 times relative to the ASR of a sample without CCL. The field emission scanning electron microscopy results indicated that these cathodes exhibited a clear change in microstructure on the surface of the LSCF CCL after 100 h of thermal treatment in oxygen. The particle agglomeration and Sr surface segregation affected the surface catalytic activity toward oxygen reduction reaction at the LSCF CCL. As a result, the ASR value increased gradually in 100 h thermal treatment. [Figure not available: see fulltext.]",
keywords = "Composite cathode, Current collector, Solid oxide fuel cell, Stability, Thickness",
author = "{Muhammed Ali}, {S. A.} and Mustafa Anwar and Mahmud, {Lily Siong} and Kalib, {Noor Shieela} and Andanastuti Muchtar and Somalu, {Mahendra Rao}",
year = "2019",
month = "1",
day = "1",
doi = "10.1007/s10008-019-04208-6",
language = "English",
journal = "Journal of Solid State Electrochemistry",
issn = "1432-8488",
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TY - JOUR

T1 - Influence of current collecting and functional layer thickness on the performance stability of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ -Ce 0.8 Sm 0.2 O 1.9 composite cathode

AU - Muhammed Ali, S. A.

AU - Anwar, Mustafa

AU - Mahmud, Lily Siong

AU - Kalib, Noor Shieela

AU - Muchtar, Andanastuti

AU - Somalu, Mahendra Rao

PY - 2019/1/1

Y1 - 2019/1/1

N2 - The effect of current collecting layer (CCL) and cathode functional layer (CFL) thicknesses on the catalytic activity of the La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ -Ce 0.8 Sm 0.2 O 1.9 (LSCF-SDC) composite cathode was investigated by electrochemical impedance spectroscopy at 600 °C for 100 h. Results revealed that the charge transfer process associated with the incorporation of O 2− ions and the surface oxygen reduction reaction rate are dependent on CFL and CCL thicknesses, respectively. Area-specific resistance is dependent on CCL thickness in high-frequency arcs and on CFL thickness in low-frequency arcs. No significant change was observed in area-specific resistance value as the thickness of LSCF CCL decreased (25–5 μm) while the LSCF-SDC CFL thickness (5-25 μm) was gradually increased. However, the LSCF-SDC composite cathode (without CCL) showed poor catalytic activity toward the oxygen reduction reaction and had a high area-specific resistance value (3.31 Ω cm 2 ). When LSCF CCL (5 μm) was used, the area-specific resistance value decreased by 16 times relative to the ASR of a sample without CCL. The field emission scanning electron microscopy results indicated that these cathodes exhibited a clear change in microstructure on the surface of the LSCF CCL after 100 h of thermal treatment in oxygen. The particle agglomeration and Sr surface segregation affected the surface catalytic activity toward oxygen reduction reaction at the LSCF CCL. As a result, the ASR value increased gradually in 100 h thermal treatment. [Figure not available: see fulltext.]

AB - The effect of current collecting layer (CCL) and cathode functional layer (CFL) thicknesses on the catalytic activity of the La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ -Ce 0.8 Sm 0.2 O 1.9 (LSCF-SDC) composite cathode was investigated by electrochemical impedance spectroscopy at 600 °C for 100 h. Results revealed that the charge transfer process associated with the incorporation of O 2− ions and the surface oxygen reduction reaction rate are dependent on CFL and CCL thicknesses, respectively. Area-specific resistance is dependent on CCL thickness in high-frequency arcs and on CFL thickness in low-frequency arcs. No significant change was observed in area-specific resistance value as the thickness of LSCF CCL decreased (25–5 μm) while the LSCF-SDC CFL thickness (5-25 μm) was gradually increased. However, the LSCF-SDC composite cathode (without CCL) showed poor catalytic activity toward the oxygen reduction reaction and had a high area-specific resistance value (3.31 Ω cm 2 ). When LSCF CCL (5 μm) was used, the area-specific resistance value decreased by 16 times relative to the ASR of a sample without CCL. The field emission scanning electron microscopy results indicated that these cathodes exhibited a clear change in microstructure on the surface of the LSCF CCL after 100 h of thermal treatment in oxygen. The particle agglomeration and Sr surface segregation affected the surface catalytic activity toward oxygen reduction reaction at the LSCF CCL. As a result, the ASR value increased gradually in 100 h thermal treatment. [Figure not available: see fulltext.]

KW - Composite cathode

KW - Current collector

KW - Solid oxide fuel cell

KW - Stability

KW - Thickness

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U2 - 10.1007/s10008-019-04208-6

DO - 10.1007/s10008-019-04208-6

M3 - Article

JO - Journal of Solid State Electrochemistry

JF - Journal of Solid State Electrochemistry

SN - 1432-8488

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